Liquid level gauge



Oct. l5, 1929. R. E. BRIGGs LIQUID LEVEL GAUGE Filed July 22, 1924 f ,Ww m un.

Patented ct. 15, 1929 ROBERT E. BRIGGS, 0F CEDAREDGE, COLORADO LIQUIDLEVEL GAUGE Application filed July 22, 1924. Serial No. 727,533.

This invention relates to indicating devices adapted to indicate at aremote point the amount of liquid within a container, the inventionbeing especially adapted for use 5 upon automobiles for the purpose ofindieating the amount of gasoline `within the fuel tank, or the amountof oil within the engine crank case, or both. l

Another object of the invention is the provision of an indicating systemand an indicator therefor, which is simple in construction, may bereadily installed and which may be accurately adjusted for properoperation to accurately indicate the amount of oil and gasoline in theirrespective containers.

With the above and other objects in view, the invention furtherincludesthe following novel features and details of construction, to behereinafter more fully described, illustrated in the accompanyingdrawings and pointed out in the appended claims.

1n the drawings i Figure 1 is a diagrammatic view illustrating theinvention.

Figure 2 is a face view of thev indicator. Figure 3 is a section takensubstantially on the line 3-3 of Figure 2.

Figure l is an enlarged fragmentary sectional view illustrating themanner of adjusting the indicator dials.

Figure 5 is a fragmentary view partly in section illustrating the meansfor stabiliz ing the liquid in the indicator tubes.

Referring to the drawings in detail wherein like characters of referencedenote corresponding parts, the reference character 10 indicates acontainer such as the fue] tank of an automobile, the crank case or oilreservoir of the engine being indicated at 11.

The indicator is designated generally at 12 and includes a block 13within which is secured the containers 14 which are adapted to containair. One of these containersis shown in Figure 3 of the drawings, therebeing one for the tank 10 and one for the reservoir 11. Extending fromeach of the containers 14 is a pipe which includes `.a transparent sighttube 15, one of which is connected by means of a tube 16 to the tank 10and the other by means of a tube 17 to the reservoir 1 The connectionwith the reservoir is at the lowermost point of the latter and may cock18. The pipe Included in the pipe 16 is an offset be through the drain16 may also be connected to 'the tank 10 through a drain cock 19.

por-

tion 2Q which carries an air valve 21. This valve is adjusted when thetank is empty so that air pressure within the pipe 16 may be regulated.

The block within which the containers l/l and tubes 15 are carried ispositioned within a casing 22. asbestos lining 23 not be subject ture.

opening 21 and movable wi his casing is provided with an that theindicator will to sudden changes of tempera- The casing is provided witha sight thin the casing and visible through the opening 24: are scaleplatesA 25.

ing graduated to gasoline indicator an pints for the oil reservoirindicator.

ing from each of the plates is asteni passes through the block 13 and isfor engagement with the tlir knurled nut 28, the latter opening providedi.

ing through the fr operating the nuts Justed.

Each of the sight tubes is adap tain a quanity of liq One of theseplates is provided ent sight tubes 15 and.

secured aduat- Entend- 2? wl ich threaded eaded bore of a operating inan n the block 13 and extend'- ont of the casing 22. By

ted to con-A uid such asial'eohol the plates may be adindi cated at 29and as'the pipe lines 16 and 17 are or gasoline is placed withand tank10, air pressur air-tight, when oil in the reservoir 11 within the pipes16 and liquid 29 within the sigh amount being` indicated on th thegasoline or oil is consumed be correspondingly lowered as willunderstood.

ln order to prevent und liquid 28 occasion quent movement of 17 willcause the t tubes to raise, the e plates 25.

the liquid will be readily ue movement of the ed by jolting and consethecontents of `he tank l() Cil and reservoir l1, the pipes 16 and 17 havesecured therein a stabilizing element. This element is in the form of aplug 30 which is secured within each of the pipes 16 and 17 in anysuitable manner, such as being threaded in the pipe. Each of the plugsis provided with a central bore or opening 3l which eX- tendstherethrough and which permits of the passage of either liquid or airbut prevents sudden passage of the saine therethrough.

Vhen the tank l0 is empty, the valve 2l is closed. introduction ofliquid within the tank will, after the valve 21 is opened, cause thehead of liquid within said tank to exert aL pressure upon the column ofair in the pipe 16 and thus affect the liquid column 29, so that thelatter will move upward or downward within the sight tube in accordancewith the pressure provided by the head of liquid within the tank. Thecontainers le provide air pressure chambers at the other endsy of thetubes and serve to act upon the adjacent ends of the liquid columns 29.

It will be apparent Vfrom the foregoing description and accompanyingdrawings that the invention provi des a gauge for the purpose specifiedwhich operates without the use of springs or cables which frequently getout of adjustment. Different types of gasoline tanks require differentgauge tubes and different size air pressure chambers while the oil gaugeprovides a straight tube for all types.

The invention is susceptible of various changes in its form, proportionsand minor details of construction and the right is herein reserved tomake such changes as properly fall Within the scope of the appendedclaim.

Having described the invention what is claimed is A liquid levelindicating gauge comprising a housing having a sight opening therein, avertically disposed substantially U-shaped tube adapted to have one endconnected with a liquid container to provide rpressure within the tube,an indicating liquid within the tube to be acted upon by said pressure,a container located within the casing and connected with the other endof the tube to provide an air pressure chamber, an indicator plateslidingly mounted within the casing adjacent the tube and visiblethrough the sight opening, a threaded rod extending from one end of theplate, a rotatable disk threadedly engaging the rod, and means to holdthe disk against axial movement to permit of adjustment of said plate.

In testimony whereof l aiix my signature.

ROBERT E. BRIGGS.

